chushihua

node_modules/element-ui/packages/slider/src/button.vue

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+<template>
+  <div
+    class="el-slider__button-wrapper"
+    @mouseenter="handleMouseEnter"
+    @mouseleave="handleMouseLeave"
+    @mousedown="onButtonDown"
+    @touchstart="onButtonDown"
+    :class="{ 'hover': hovering, 'dragging': dragging }"
+    :style="wrapperStyle"
+    ref="button"
+    tabindex="0"
+    @focus="handleMouseEnter"
+    @blur="handleMouseLeave"
+    @keydown.left="onLeftKeyDown"
+    @keydown.right="onRightKeyDown"
+    @keydown.down.prevent="onLeftKeyDown"
+    @keydown.up.prevent="onRightKeyDown"
+  >
+    <el-tooltip
+      placement="top"
+      ref="tooltip"
+      :popper-class="tooltipClass"
+      :disabled="!showTooltip">
+      <span slot="content">{{ formatValue }}</span>
+      <div class="el-slider__button" :class="{ 'hover': hovering, 'dragging': dragging }"></div>
+    </el-tooltip>
+  </div>
+</template>
+
+<script>
+  import ElTooltip from 'element-ui/packages/tooltip';
+
+  export default {
+    name: 'ElSliderButton',
+
+    components: {
+      ElTooltip
+    },
+
+    props: {
+      value: {
+        type: Number,
+        default: 0
+      },
+      vertical: {
+        type: Boolean,
+        default: false
+      },
+      tooltipClass: String
+    },
+
+    data() {
+      return {
+        hovering: false,
+        dragging: false,
+        isClick: false,
+        startX: 0,
+        currentX: 0,
+        startY: 0,
+        currentY: 0,
+        startPosition: 0,
+        newPosition: null,
+        oldValue: this.value
+      };
+    },
+
+    computed: {
+      disabled() {
+        return this.$parent.sliderDisabled;
+      },
+
+      max() {
+        return this.$parent.max;
+      },
+
+      min() {
+        return this.$parent.min;
+      },
+
+      step() {
+        return this.$parent.step;
+      },
+
+      showTooltip() {
+        return this.$parent.showTooltip;
+      },
+
+      precision() {
+        return this.$parent.precision;
+      },
+
+      currentPosition() {
+        return `${ (this.value - this.min) / (this.max - this.min) * 100 }%`;
+      },
+
+      enableFormat() {
+        return this.$parent.formatTooltip instanceof Function;
+      },
+
+      formatValue() {
+        return this.enableFormat && this.$parent.formatTooltip(this.value) || this.value;
+      },
+
+      wrapperStyle() {
+        return this.vertical ? { bottom: this.currentPosition } : { left: this.currentPosition };
+      }
+    },
+
+    watch: {
+      dragging(val) {
+        this.$parent.dragging = val;
+      }
+    },
+
+    methods: {
+      displayTooltip() {
+        this.$refs.tooltip && (this.$refs.tooltip.showPopper = true);
+      },
+
+      hideTooltip() {
+        this.$refs.tooltip && (this.$refs.tooltip.showPopper = false);
+      },
+
+      handleMouseEnter() {
+        this.hovering = true;
+        this.displayTooltip();
+      },
+
+      handleMouseLeave() {
+        this.hovering = false;
+        this.hideTooltip();
+      },
+
+      onButtonDown(event) {
+        if (this.disabled) return;
+        event.preventDefault();
+        this.onDragStart(event);
+        window.addEventListener('mousemove', this.onDragging);
+        window.addEventListener('touchmove', this.onDragging);
+        window.addEventListener('mouseup', this.onDragEnd);
+        window.addEventListener('touchend', this.onDragEnd);
+        window.addEventListener('contextmenu', this.onDragEnd);
+      },
+      onLeftKeyDown() {
+        if (this.disabled) return;
+        this.newPosition = parseFloat(this.currentPosition) - this.step / (this.max - this.min) * 100;
+        this.setPosition(this.newPosition);
+      },
+      onRightKeyDown() {
+        if (this.disabled) return;
+        this.newPosition = parseFloat(this.currentPosition) + this.step / (this.max - this.min) * 100;
+        this.setPosition(this.newPosition);
+      },
+      onDragStart(event) {
+        this.dragging = true;
+        this.isClick = true;
+        if (event.type === 'touchstart') {
+          event.clientY = event.touches[0].clientY;
+          event.clientX = event.touches[0].clientX;
+        }
+        if (this.vertical) {
+          this.startY = event.clientY;
+        } else {
+          this.startX = event.clientX;
+        }
+        this.startPosition = parseFloat(this.currentPosition);
+        this.newPosition = this.startPosition;
+      },
+
+      onDragging(event) {
+        if (this.dragging) {
+          this.isClick = false;
+          this.displayTooltip();
+          this.$parent.resetSize();
+          let diff = 0;
+          if (event.type === 'touchmove') {
+            event.clientY = event.touches[0].clientY;
+            event.clientX = event.touches[0].clientX;
+          }
+          if (this.vertical) {
+            this.currentY = event.clientY;
+            diff = (this.startY - this.currentY) / this.$parent.sliderSize * 100;
+          } else {
+            this.currentX = event.clientX;
+            diff = (this.currentX - this.startX) / this.$parent.sliderSize * 100;
+          }
+          this.newPosition = this.startPosition + diff;
+          this.setPosition(this.newPosition);
+        }
+      },
+
+      onDragEnd() {
+        if (this.dragging) {
+          /*
+           * 防止在 mouseup 后立即触发 click，导致滑块有几率产生一小段位移
+           * 不使用 preventDefault 是因为 mouseup 和 click 没有注册在同一个 DOM 上
+           */
+          setTimeout(() => {
+            this.dragging = false;
+            this.hideTooltip();
+            if (!this.isClick) {
+              this.setPosition(this.newPosition);
+              this.$parent.emitChange();
+            }
+          }, 0);
+          window.removeEventListener('mousemove', this.onDragging);
+          window.removeEventListener('touchmove', this.onDragging);
+          window.removeEventListener('mouseup', this.onDragEnd);
+          window.removeEventListener('touchend', this.onDragEnd);
+          window.removeEventListener('contextmenu', this.onDragEnd);
+        }
+      },
+
+      setPosition(newPosition) {
+        if (newPosition === null || isNaN(newPosition)) return;
+        if (newPosition < 0) {
+          newPosition = 0;
+        } else if (newPosition > 100) {
+          newPosition = 100;
+        }
+        const lengthPerStep = 100 / ((this.max - this.min) / this.step);
+        const steps = Math.round(newPosition / lengthPerStep);
+        let value = steps * lengthPerStep * (this.max - this.min) * 0.01 + this.min;
+        value = parseFloat(value.toFixed(this.precision));
+        this.$emit('input', value);
+        this.$nextTick(() => {
+          this.$refs.tooltip && this.$refs.tooltip.updatePopper();
+        });
+        if (!this.dragging && this.value !== this.oldValue) {
+          this.oldValue = this.value;
+        }
+      }
+    }
+  };
+</script>